CN110925375B - Thread drive limiting self-locking mechanism - Google Patents
Thread drive limiting self-locking mechanism Download PDFInfo
- Publication number
- CN110925375B CN110925375B CN201911384122.4A CN201911384122A CN110925375B CN 110925375 B CN110925375 B CN 110925375B CN 201911384122 A CN201911384122 A CN 201911384122A CN 110925375 B CN110925375 B CN 110925375B
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- CN
- China
- Prior art keywords
- transmission
- self
- transmission nut
- nut
- chain wheel
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 230000005540 biological transmission Effects 0.000 claims abstract description 120
- 238000009434 installation Methods 0.000 abstract 1
- 230000001419 dependent effect Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H25/00—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms
- F16H25/18—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms for conveying or interconverting oscillating or reciprocating motions
- F16H25/20—Screw mechanisms
- F16H25/24—Elements essential to such mechanisms, e.g. screws, nuts
- F16H25/2454—Brakes; Rotational locks
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D41/00—Freewheels or freewheel clutches
- F16D41/20—Freewheels or freewheel clutches with expandable or contractable clamping ring or band
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H25/00—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms
- F16H25/18—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms for conveying or interconverting oscillating or reciprocating motions
- F16H25/20—Screw mechanisms
- F16H25/24—Elements essential to such mechanisms, e.g. screws, nuts
- F16H25/2472—Safety nuts
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Transmission Devices (AREA)
Abstract
A thread transmission limit self-locking mechanism belongs to the technical field of thread transmission and solves the problem that a driven end driving screw reversely rotates to drive a driving end to rotate to damage a driving motor due to dead weight of a part after the transmission is stopped or the motor is powered off in the existing thread transmission structure. According to the invention, a mode of interference installation of the limiting device and the cylindrical fixing seat is adopted, when the chain wheel actively rotates, the self-locking device is tightened towards the axis direction, a gap is formed between the self-locking device and the cylindrical fixing seat, the self-locking device rotates along with the chain wheel, and the transmission nut is driven to rotate through the bulge on the transmission nut, so that the transmission screw is driven to move forwards or backwards along the axial direction; because the transmission stops or the motor cuts off the power supply, the reverse rotation is generated due to the dead weight of the part, and the torque force is transmitted to the transmission nut by the transmission screw, the friction force between the tension of the self-locking device and the inner wall of the fixing seat is increased by the transmission nut, and the rotation of the transmission nut is prevented to realize self-locking. The invention is suitable for thread transmission limiting self-locking.
Description
Technical Field
The invention belongs to the technical field of thread transmission, and relates to a thread transmission limiting self-locking mechanism.
Background
The screw thread transmission changes the rotary motion into the linear motion and simultaneously transmits energy and force, has the characteristics of simple structure, convenient processing, low cost and the like, and is widely applied to equipment such as metal cutting machine tools, friction presses, jacks and the like. In the vertical thread transmission process, the driven end transmission screw rod rotates reversely due to the dead weight of the part after the transmission is stopped or the motor is powered off, so that the driving end is driven to rotate, and the driving motor is damaged.
Disclosure of Invention
The invention provides a thread transmission limiting self-locking mechanism, which aims to solve the problem that the existing thread transmission structure is characterized in that after transmission is stopped or a motor is powered off, a driven end transmission screw rod is reversely rotated due to the dead weight of a part to drive a driving end to rotate so as to damage a driving motor.
The invention relates to a thread transmission limiting self-locking mechanism, which comprises a transmission screw rod 2, a cylindrical fixing seat 4, a transmission nut 5, a self-locking device 6 and a chain wheel 7;
the transmission screw rod 2 is in threaded connection with the transmission nut 5; the chain wheel 7 is sleeved on the transmission nut 5, and the self-locking device 6 is arranged between the chain wheel 7 and the cylindrical fixing seat 4; the self-locking device 6 is in interference fit with the cylindrical fixing seat 4, and the fixed end of the cylindrical fixing seat 4 is fixed on the fixing structure through a screw;
The outer wall of the transmission nut 5 is provided with a strip-shaped bulge, and the length direction of the strip-shaped bulge is the axial direction of the transmission nut 5 and is parallel to the central line of the transmission nut 5;
The side wall of the chain wheel 7 is provided with a rectangular opening which is adapted to the strip-shaped bulge on the outer wall of the transmission nut 5;
the self-locking device 6 is a torsion spring, and the length of the free state of the torsion spring is smaller than that of the transmission nut 5;
Both ends of the torsion spring are limiting ends, and the two limiting ends are inserted into rectangular openings in the side wall of the chain wheel 7 and are respectively positioned at both sides of the protrusion of the outer wall of the transmission nut 5; a gap is reserved between the chain wheel 7 and the limiting end of the torsion spring, and a gap is reserved between the limiting end of the torsion spring and the bulge of the transmission nut 5;
when the chain wheel 7 rotates, the torsion spring tightens towards the axle center and generates a gap with the inner wall of the cylindrical fixed seat 4, and the torsion spring rotates along with the chain wheel 7 to drive the transmission nut 5 to rotate and drive the transmission screw 2 to axially move;
When the transmission is stopped or the motor is powered off, the transmission nut 5 reversely rotates, and the torsion spring outwards expands to be in interference contact with the cylindrical fixing seat 4, so that the transmission nut 5 is prevented from reversely rotating.
Further, the length of the strip-shaped bulge on the outer wall of the transmission nut 5 is smaller than the length of the transmission nut 5.
Further, the sprocket 7 includes a bearing and a gear, the length of the bearing being greater than the width of the gear.
Further, the device also comprises a positioning washer 1, wherein the positioning washer 1 is fixedly sleeved at the driving end of the driving screw 2.
Further, the device also comprises a distance ring 3, wherein the distance ring 3 is sleeved at one end of the transmission nut 5, and one end of the transmission nut 5 is close to the transmission end of the transmission screw 2.
According to the invention, a mode of interference mounting of the limiting device and the cylindrical fixing seat is adopted, when the chain wheel actively rotates, the self-locking device is tightened towards the axis direction, a gap is formed between the self-locking device and the cylindrical fixing seat, the self-locking device rotates along with the chain wheel, and the transmission nut 5 is driven to rotate through the bulge on the transmission nut 5, so that the transmission screw 2 is driven to move forwards or backwards along the axial direction; because the transmission stops or the motor is powered off, the reverse rotation is generated due to the dead weight of the part, at the moment, the transmission screw rod 2 transmits torsion to the transmission nut 5, the transmission nut 5 enables the self-locking device 6 to be tensioned and the friction force between the self-locking device and the inner wall of the cylindrical fixing seat 4 to be increased, the transmission nut 5 is prevented from rotating to realize self-locking, and the driving end equipment is protected.
Drawings
FIG. 1 is an axial cross-sectional view of a thread drive limit self-locking mechanism of the present invention;
Fig. 2 is a radial cross-sectional view of a threaded drive limit self-locking mechanism shaft according to the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other.
The invention is further described below with reference to the drawings and specific examples, which are not intended to be limiting.
The first embodiment is as follows: next, referring to fig. 1 and 2, a thread transmission limiting self-locking mechanism according to the present embodiment is described, which includes a transmission screw 2, a cylindrical fixing seat 4, a transmission nut 5, a self-locking device 6 and a sprocket 7;
the transmission screw rod 2 is in threaded connection with the transmission nut 5; the chain wheel 7 is sleeved on the transmission nut 5, and the self-locking device 6 is arranged between the chain wheel 7 and the cylindrical fixing seat 4; the self-locking device 6 is in interference fit with the cylindrical fixing seat 4, and the fixed end of the cylindrical fixing seat 4 is fixed on the fixing structure through a screw;
The outer wall of the transmission nut 5 is provided with a strip-shaped bulge, and the length direction of the strip-shaped bulge is the axial direction of the transmission nut 5 and is parallel to the central line of the transmission nut 5;
The side wall of the chain wheel 7 is provided with a rectangular opening which is adapted to the strip-shaped bulge on the outer wall of the transmission nut 5;
the self-locking device 6 is a torsion spring, and the length of the free state of the torsion spring is smaller than that of the transmission nut 5;
Both ends of the torsion spring are limiting ends, and the two limiting ends are inserted into rectangular openings in the side wall of the chain wheel 7 and are respectively positioned at both sides of the protrusion of the outer wall of the transmission nut 5; a gap is reserved between the chain wheel 7 and the limiting end of the torsion spring, and a gap is reserved between the limiting end of the torsion spring and the bulge of the transmission nut 5;
when the chain wheel 7 rotates, the torsion spring tightens towards the axle center and generates a gap with the inner wall of the cylindrical fixed seat 4, and the torsion spring rotates along with the chain wheel 7 to drive the transmission nut 5 to rotate and drive the transmission screw 2 to axially move;
When the transmission is stopped or the motor is powered off, the transmission nut 5 reversely rotates, and the torsion spring outwards expands to be in interference contact with the cylindrical fixing seat 4, so that the transmission nut 5 is prevented from reversely rotating.
The transmission nut 5 of this embodiment is cylindric, the inner wall of transmission nut 5 is equipped with the internal thread, and the outer wall is equipped with and is equipped with the bar arch along the generating line direction.
Further, the length of the strip-shaped bulge on the outer wall of the transmission nut 5 is smaller than the length of the transmission nut 5.
Further, the sprocket 7 includes a bearing and a gear, the length of the bearing being greater than the width of the gear.
Further, the device also comprises a positioning washer 1, wherein the positioning washer 1 is fixedly sleeved at the driving end of the driving screw 2.
Further, the device also comprises a distance ring 3, wherein the distance ring 3 is sleeved at one end of the transmission nut 5, and one end of the transmission nut 5 is close to the transmission end of the transmission screw 2.
According to the thread transmission limiting self-locking mechanism, the driving end chain wheel 7 drives the transmission nut 5 to rotate through the self-locking device 6, the self-locking device 6 is arranged between the transmission nut 5 and the cylindrical fixing seat 4, the transmission nut 5 is axially fixed through the distance ring 3 and can only circumferentially rotate to drive the transmission screw 2 to axially move, the positioning washer 1 is arranged at the shaft end of the transmission screw 2 to limit, the transmission nut 5 has a self-locking and anti-reversion function in the thread transmission process, and the transmission screw 2 is reversed to drive the driving end to rotate to damage driving end equipment after the transmission is stopped or the motor is powered off. The self-locking device 6 is arranged between the transmission nut 5 and the cylindrical fixing seat 4 to form a thread transmission self-locking mechanism. The driving end can drive the driven end to rotate, the driven end has self-locking and anti-reversion functions, and the driving end cannot be driven to rotate, so that the function of protecting equipment at the driving end is achieved.
Although the invention herein has been described with reference to particular embodiments, it is to be understood that these embodiments are merely illustrative of the principles and applications of the present invention. It is therefore to be understood that numerous modifications may be made to the illustrative embodiments and that other arrangements may be devised without departing from the spirit and scope of the present invention as defined by the appended claims. It should be understood that the different dependent claims and the features described herein may be combined in ways other than as described in the original claims. It is also to be understood that features described in connection with separate embodiments may be used in other described embodiments.
Claims (3)
1. The thread transmission limiting self-locking mechanism is characterized by comprising a transmission screw (2), a cylindrical fixing seat (4), a transmission nut (5), a self-locking device (6) and a chain wheel (7);
the transmission screw (2) is in threaded connection with the transmission nut (5); the chain wheel (7) is sleeved on the transmission nut (5), and the self-locking device (6) is arranged between the chain wheel (7) and the cylindrical fixing seat (4); the self-locking device (6) is in interference fit with the cylindrical fixing seat (4), and the fixed end of the cylindrical fixing seat (4) is fixed on the fixing structure through a screw;
the outer wall of the transmission nut (5) is provided with a strip-shaped bulge, and the length direction of the strip-shaped bulge is the axial direction of the transmission nut (5) and is parallel to the central line of the transmission nut (5);
The side wall of the chain wheel (7) is provided with a rectangular opening which is adapted to the strip-shaped bulge on the outer wall of the transmission nut (5);
The self-locking device (6) is a torsion spring, and the length of the free state of the torsion spring is smaller than that of the transmission nut (5);
both ends of the torsion spring are limiting ends, and the two limiting ends are inserted into rectangular openings in the side wall of the chain wheel (7) and are respectively positioned at both sides of the protrusion of the outer wall of the transmission nut (5); a gap is reserved between the chain wheel (7) and the limiting end of the torsion spring, and a gap is reserved between the limiting end of the torsion spring and the bulge of the transmission nut (5);
When the chain wheel (7) rotates, the torsion spring tightens towards the axle center and generates a gap with the inner wall of the cylindrical fixing seat (4), and the torsion spring rotates along with the chain wheel (7) to drive the transmission nut (5) to rotate and drive the transmission screw (2) to axially move;
when the transmission is stopped or the motor is powered off, the transmission nut (5) reversely rotates, and the torsion spring outwards expands to be in interference contact with the cylindrical fixing seat (4) so as to prevent the transmission nut (5) from reversely rotating;
The device also comprises a positioning washer (1) and a distance ring (3), wherein the positioning washer (1) is fixedly sleeved at the transmission end of the transmission screw (2); the distance ring (3) is sleeved at one end of the transmission nut (5), and one end of the transmission nut (5) is close to the transmission end of the transmission screw (2).
2. The thread transmission limit self-locking mechanism according to claim 1, wherein the length of the strip-shaped protrusion of the outer wall of the transmission nut (5) is smaller than the length of the transmission nut (5).
3. A screw drive limit self locking mechanism according to claim 1, characterized in that the sprocket (7) comprises a bearing and a gear, the length of the bearing being larger than the width of the gear.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911384122.4A CN110925375B (en) | 2019-12-28 | 2019-12-28 | Thread drive limiting self-locking mechanism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911384122.4A CN110925375B (en) | 2019-12-28 | 2019-12-28 | Thread drive limiting self-locking mechanism |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110925375A CN110925375A (en) | 2020-03-27 |
| CN110925375B true CN110925375B (en) | 2024-08-30 |
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ID=69862314
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911384122.4A Active CN110925375B (en) | 2019-12-28 | 2019-12-28 | Thread drive limiting self-locking mechanism |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110925375B (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN211082735U (en) * | 2019-12-28 | 2020-07-24 | 中国船舶重工集团公司第七0三研究所 | Screw thread transmission limiting self-locking mechanism |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW515495U (en) * | 2002-03-25 | 2002-12-21 | Hiwin Mikrosystem Corp | Self-braking mechanism for linear actuator |
| KR100580531B1 (en) * | 2004-11-17 | 2006-05-15 | 현대자동차주식회사 | Locking structure of a electronic parking break |
| CN102829145B (en) * | 2012-09-07 | 2015-04-22 | 西北工业大学 | Planetary roller screw pair capable of being self-locked |
| CN107676445A (en) * | 2017-09-09 | 2018-02-09 | 浙江捷昌线性驱动科技股份有限公司 | A kind of electric pushrod |
| CN208723699U (en) * | 2018-04-19 | 2019-04-09 | 浙江捷昌线性驱动科技股份有限公司 | A kind of linear actuators of unidirectional power transmitting |
-
2019
- 2019-12-28 CN CN201911384122.4A patent/CN110925375B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN211082735U (en) * | 2019-12-28 | 2020-07-24 | 中国船舶重工集团公司第七0三研究所 | Screw thread transmission limiting self-locking mechanism |
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| Publication number | Publication date |
|---|---|
| CN110925375A (en) | 2020-03-27 |
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